Preventive medicine against grape downy mildew

Downy mildew is a multiple grape disease that mainly damages the leaves and often causes a large amount of fallen leaves. The disease can also infect young shoots, inflorescences, and young fruit. The growth of the diseased culprit was stopped and the disease was deformed. When the disease was severe, the tip of the disease died and the ear fell off. This not only led to a reduction in the production in the year, but also due to the poor growth of the shoots and their vulnerability to freezing damage. The output in the coming year will also be affected. In order to screen out the agents that can effectively control grape downy mildew, the Division of Plant Protection of Yantai Academy of Agricultural Sciences in Shandong Province, Shu Ding et al., tested Baitai (60% pyraclostrobin-Senson water dispersible granules) and other five fungicides. Field efficacy trials.
The test was conducted in vineyards with severe downy mildew, and was treated with five pharmaceuticals, which were Baitai 1500-fold solution, product-run (70% dextran dry suspension agent) 700 times solution, and Kairun (25% pyrazole). Ethericide emulsifiable concentrate) 3000 times solution, Kelu (72% cream urea manganese zinc wettable powder) 700 times and 80% ethoxyphosphoric aluminum wettable powder 500 times, once every 10 days, continuous control 3 times. With clear water as a control.

According to the pilot study, the diseased leaf rate and disease index of grape downy mildew in the Qingshui control area continued to increase, and the back of the leaves was covered with moldy layers, and the leaves were scorched and even fell off. However, the grapes with the above five fungicides had better conditions. control. Seven days after the second drug, Kairun had the best control effect, reaching 93.83%, which was significantly better than the other several drugs. In the 10 days after the third drug treatment, the efficacy of all treatments was above 81.26%. And Baitai's control effect was 98.15% and 97.38%, respectively, which was significantly better than Kelu and phosphine aluminum.

The test results showed that Baitai and Kairun had good control effects on grape downy mildew. Although the control effects of Kelu and acetylphosphine were lower than those of Baitai and Kairun, they also reached more than 88%. These four kinds of sterilization The agent can be used as an effective medicament for controlling grape downy mildew. The control efficacy of Jinrun is only 81.26%. It is not suitable to be used as the main agent for preventing and treating grape downy mildew, but it can be used as a protective fungicide before the occurrence of downy mildew. To control grape downy mildew in production, it is necessary to control the disease before or during the initial stage of the disease, and to control it again according to the climatic conditions and the degree of disease development for about 10 days. Generally, it is controlled continuously for 2 to 3 times. In order to avoid the resistance of single-use bacteria, a variety of fungicides should be used interchangeably.

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